CY7C419/21/25/29/33
Switching Waveforms
Asynchronous ReadandWrite
t
t
PR
RC
t
A
t
RR
t
A
R
t
t
t
HZR
LZR
DVR
DATA VALID
DATA VALID
Q –Q
0
8
t
WC
t
t
WR
PW
W
t
t
HD
SD
DATA VALID
DATA VALID
D –D
0
8
C420–9
Master Reset
[12]
t
MRSC
t
PMR
MR
[11]
R, W
t
RPW
t
WPW
t
RMR
t
EFL
EF
t
HFH
HF
FF
t
FFH
C420–10
Half-Full Flag
HALF FULL
HALF FULL+1
HALF FULL
RHF
W
R
t
t
WHF
HF
C420–11
Notes:
11. W and R ≥ VIH around the rising edge of MR.
12. tMRSC = tPMR + tRMR
.
Document #: 38-06001 Rev. *A
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